Power feeding device, wireless power feeding system using the same and wireless power feeding method
First Claim
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1. A power feeding device comprising:
- an antenna circuit;
a first oscillation circuit;
a mixer; and
a control circuit including a coupler, a determination circuit and a second oscillation circuit,wherein the coupler is configured to detect a signal reflected from a power receiver,wherein the determination circuit is configured to calculate a reflection coefficient from the signal detected by the coupler, and to output the reflection coefficient to the second oscillation circuit, andwherein the mixer is configured to mix a first power signal generated by the first oscillation circuit and a second power signal generated by the second oscillation circuit and to output the mixed signal to the antenna circuit.
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Abstract
An object is to provide a power feeding device, a power feeding system, and a power feeding method which are more convenient for a power feeding user at the power receiving end. The power feeding device includes a means of controlling a frequency of a power signal transmitted to a power receiver, based on a proportion of signals, among power signals output to an antenna circuit, that return from the power receiver to the antenna circuit without feeding power to the power receiver.
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Citations
31 Claims
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1. A power feeding device comprising:
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an antenna circuit; a first oscillation circuit; a mixer; and a control circuit including a coupler, a determination circuit and a second oscillation circuit, wherein the coupler is configured to detect a signal reflected from a power receiver, wherein the determination circuit is configured to calculate a reflection coefficient from the signal detected by the coupler, and to output the reflection coefficient to the second oscillation circuit, and wherein the mixer is configured to mix a first power signal generated by the first oscillation circuit and a second power signal generated by the second oscillation circuit and to output the mixed signal to the antenna circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power feeding device comprising:
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a transmission/reception circuit portion configured to transmit and receive an electromagnetic wave; a signal processing circuit portion configured to process a power signal of an electromagnetic wave that is transmitted and received by the transmission/reception circuit portion; and a power supply portion configured to supply power to be transmitted to a power receiver, wherein the transmission/reception circuit portion includes an antenna circuit, a rectifier circuit, a mixer, a demodulation circuit, a first oscillation circuit, and a control circuit, wherein the antenna circuit is configured to receive a signal reflected from the power receiver, wherein the control circuit includes a coupler, a determination circuit, a second oscillation circuit, and a third oscillation circuit, wherein the coupler is configured to detect the signal reflected from the power receiver, wherein the determination circuit is configured to calculate a reflection coefficient from the signal detected by the coupler, and to output the reflection coefficient to the second oscillation circuit and the third oscillation circuit, wherein the second oscillation circuit is configured to output a power signal with a frequency that changes continuously with time, wherein the third oscillation circuit is configured to output a power signal with one determined frequency, wherein, when the reflection coefficient is less than or equal to a standard reflection coefficient, a second power signal corresponds to the output of the third oscillation circuit and the second oscillation circuit stops, wherein, when the reflection coefficient is larger than the standard reflection coefficient, the second power signal corresponds to the output of the second oscillation circuit and the third oscillation circuit stops, and wherein the mixer is configured to mix a first power signal generated by the first oscillation circuit and the second power signal generated by the control circuit and to output the mixed signal to the antenna circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A wireless power feeding method comprising the steps of:
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after power signals are transmitted from an antenna circuit of a power feeding device to a power receiver, calculating a proportion of signals, among the power signals output to the antenna circuit, that return from an antenna circuit of the power receiver, and outputting a reflection coefficient obtained by the calculation; in a first case where the reflection coefficient of the power signals is less than or equal to a standard reflection coefficient, transmitting a first power signal from the antenna circuit to the power receiver, wherein the first power signal has one determined frequency; in a second case where the reflection coefficient of the power signals is more than or equal to the standard reflection coefficient, transmitting a second power signal from the antenna circuit to the power receiver, wherein the second power signal has a frequency that changes continuously with time; in the second case, calculating a reflection coefficient of a power signal with a frequency that changes continuously with time, and detecting a frequency of a power signal corresponding to the minimum reflection coefficient; and in the second case, transmitting the power signal of the detected frequency from the antenna circuit to the power receiver. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A power feeding device comprising:
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an antenna circuit; a first oscillation circuit; a mixer; and a control circuit including a coupler, a determination circuit and a second oscillation circuit, wherein the coupler is configured to detect a signal reflected from a power receiver, wherein the determination circuit is configured to output a reflection coefficient to the second oscillation circuit, the reflection coefficient being based on the signal detected by the coupler, and wherein the mixer is configured to output a mixed signal to the antenna circuit, the mixed signal being generated by mixing a first power signal generated by the first oscillation circuit and a second power signal generated by the second oscillation circuit. - View Dependent Claims (23, 24, 25, 26)
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27. A power feeding device comprising:
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a first oscillation circuit; a mixer; and a control circuit including a coupler, a determination circuit and a second oscillation circuit, wherein the coupler is configured to detect a signal reflected from a power receiver, wherein the determination circuit is configured to output a reflection coefficient to the second oscillation circuit, the reflection coefficient being based on the signal detected by the coupler, and wherein the mixer is configured to output a mixed signal to an antenna circuit, the mixed signal being generated by mixing a first power signal generated by the first oscillation circuit and a second power signal generated by the second oscillation circuit. - View Dependent Claims (28, 29, 30, 31)
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Specification